wx.onMemoryWarning(function callback) 如何回收请求过的图片资源等文件，使其不占用运行内存？
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- Function explaination: Mini Program/Development/Extended/Mini Program alliance/Push client/Function explaination
- Function explaination: Mini Program/Development/Extended/Mini Program alliance/Merchant end/Function explaination
- wx.onMemoryWarning: 小程序/开发/API/设备/内存/wx.onMemoryWarning
- Callback Back Sample: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Event callback access process: 小商店/Development/Extended/Trading component/Custom trading components and open interfaces/Event callback/Event callback access process